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Shalnov [3]
4 years ago
8

Science Mysteries: Why Do People Yawn?

English
1 answer:
stiv31 [10]4 years ago
4 0

Answer:

mystery

Explanation:

Throughout the passage, the author repeatedly refers to yawning as a mystery. For example, "One mystery that still remains unsolved is why we yawn—what makes us yawn and what purpose it serves." and "Scientists will continue to investigate the mystery of the yawn." and also, "while this behavior still is largely a mystery, one thing is certain:"

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